The motors are comparable 11BL vs 12BL. And both appear
to be underhung. Major diffs being XMAX, tightness of the
suspensions, and moving mass. The parasitic choke isn't as
bad as I had quoted either... All the same, my plan above
stands reasonably solid.

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You take away one of his BassLites, that corrects for box
tuning, but its also gonna cut into efficiency. Hows that
gonna compete with the MOW's which are already +5dB
louder??? Hoffmans iron law etc etc...

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I agree that separately enclosing the MOWs into a much
smaller volume would be a safer bet. But how to do that?
Make cups from the bottom of Home Despot buckets???

Well here's what I'm thinking right now. I would consider the single basslites that's vented idea but I don't know how I would fill the 12" hole left from the driver. And I could turn the second basslites into a bass cab. But realistically I'm thinking about putting holes in the shelf and running both sets at full range/pull the crossovers

You make a 12" blockoff plate with ports in it. I've done that before.
It'll go deep, but one basslite never gonna be as loud as two MOWs...

Taking out one basslite allows for reasonable tuning for that driver, increasing bass production. The MOWs will dominate the sound anyway, whether there are 1 or 2 basslites - they play in the most sensitive range of hearing and they are more efficient.

The basslite driver appears to be designed for a 80Hz. punch peak in a box of around 2cu. ft., so two of them in a vented box of about the size you have is just about right.

For a down tuned e string or a five string, a peak at 50-60Hz. is preferable.

All you really need is one guitar driver for two of these, (using a series capacitor to keep out the lows), and putting it in an open backed box on top of the other one would seem to be the easiest way of getting what your after.
rcw.

Ok, with no crossovers and still separated it sounds better. more punch due to the MOWs. the basslites add some rounded bass but are still overpowered by the MOWs. I guess I'll cut some holes through the shelf and see what happens